Score

Description of severity

1

Plants showing no symptoms

2

unclear virus symptoms

3

Clear virus symptoms > 5% of plants per plot

4

Clear virus symptoms at 6% to 15% of plants per plot

5

Clear virus symptoms at 16% to 33% of plant per plot

6

Clear virus symptoms at 34% to 66% of plants per plot

7

Clear virus symptoms at 67% to 99% of plants per plot

8

Clear virus symptoms at all plants per plot

9

Severe virus symptoms in all plants per plot